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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
32/c = 2 // - 2
32/c-2 = 0
32*c^-1 = 2 // : 32
c^-1 = 1/16
-1 < 0
1/(c^1) = 1/16 // * c^1
1 = 1/16*c^1 // : 1/16
16 = c^1
c = 16
c = 16
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